ABC 048, finished all with help of editorial

atcoder/beginner_contests/abc048/src/bin/c.rs

@@ -0,0 +1,25 @@
+use proconio::input;
+
+fn main(){
+    input!{
+        n: u64,
+        x: u64,
+        mut a: [u64; n],
+    };
+
+    let mut result = 0;
+    for i in 0..=((n-2) as usize) {
+        if a[i] + a[i+1] > x {
+            let dif = a[i] + a[i+1] - x;
+            if dif > a[i+1] {
+                a[i] -= dif - a[i+1];
+                a[i+1] = 0;
+            } else {
+                a[i+1] -= dif;
+            }
+            result += dif;
+        }
+    }
+
+    println!("{}", result);
+}